I second both Ikea and QingShiQiao salmon. QingShiQiao 2nd floor in the corner has a good shop with some frozen stuff, usually big chunks of frozen salmon which are good and it’s pretty cheap although fluctuates depending on market price. Ikea is great too, I didn’t realize it’s half price – heading there this evening to stock up then 😀 I always sift through like a rummaging old garbage collector to try to find equally sliced pieces so filets cook evenly when cooking multiple, otherwise the quality/price there is fantastic imo compared to anything else available here.